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Linux/arch/mips/netlogic/xlr/wakeup.c

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  1 /*
  2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
  3  * reserved.
  4  *
  5  * This software is available to you under a choice of one of two
  6  * licenses.  You may choose to be licensed under the terms of the GNU
  7  * General Public License (GPL) Version 2, available from the file
  8  * COPYING in the main directory of this source tree, or the NetLogic
  9  * license below:
 10  *
 11  * Redistribution and use in source and binary forms, with or without
 12  * modification, are permitted provided that the following conditions
 13  * are met:
 14  *
 15  * 1. Redistributions of source code must retain the above copyright
 16  *    notice, this list of conditions and the following disclaimer.
 17  * 2. Redistributions in binary form must reproduce the above copyright
 18  *    notice, this list of conditions and the following disclaimer in
 19  *    the documentation and/or other materials provided with the
 20  *    distribution.
 21  *
 22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
 23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
 26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 33  */
 34 
 35 #include <linux/init.h>
 36 #include <linux/delay.h>
 37 #include <linux/threads.h>
 38 
 39 #include <asm/asm.h>
 40 #include <asm/asm-offsets.h>
 41 #include <asm/mipsregs.h>
 42 #include <asm/addrspace.h>
 43 #include <asm/string.h>
 44 
 45 #include <asm/netlogic/haldefs.h>
 46 #include <asm/netlogic/common.h>
 47 #include <asm/netlogic/mips-extns.h>
 48 
 49 #include <asm/netlogic/xlr/iomap.h>
 50 #include <asm/netlogic/xlr/pic.h>
 51 
 52 int __cpuinit xlr_wakeup_secondary_cpus(void)
 53 {
 54         struct nlm_soc_info *nodep;
 55         unsigned int i, j, boot_cpu;
 56 
 57         /*
 58          *  In case of RMI boot, hit with NMI to get the cores
 59          *  from bootloader to linux code.
 60          */
 61         nodep = nlm_get_node(0);
 62         boot_cpu = hard_smp_processor_id();
 63         nlm_set_nmi_handler(nlm_rmiboot_preboot);
 64         for (i = 0; i < NR_CPUS; i++) {
 65                 if (i == boot_cpu || !cpumask_test_cpu(i, &nlm_cpumask))
 66                         continue;
 67                 nlm_pic_send_ipi(nodep->picbase, i, 1, 1); /* send NMI */
 68         }
 69 
 70         /* Fill up the coremask early */
 71         nodep->coremask = 1;
 72         for (i = 1; i < NLM_CORES_PER_NODE; i++) {
 73                 for (j = 1000000; j > 0; j--) {
 74                         if (nlm_cpu_ready[i * NLM_THREADS_PER_CORE])
 75                                 break;
 76                         udelay(10);
 77                 }
 78                 if (j != 0)
 79                         nodep->coremask |= (1u << i);
 80                 else
 81                         pr_err("Failed to wakeup core %d\n", i);
 82         }
 83 
 84         return 0;
 85 }
 86 

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